His funny Outer Banks book publishes during the quarantine, with no stores to sell it, but he remains sanquine For Jack Sandberg, as for everyone else, the coronavirus and its accompanying quarantine have changed everything. Fortunately “Uncle Jack” has a sense of humor about everything. Sandberg is the humorist who came to define North Carolina’s beloved Outer Banks, writing for two now-defunct newspapers in the 1980s, 1990s and 2000s. His writing was funny, yes, but savvy, too, as more than one critic noted approvingly. He loved the OBX, but “Uncle Jack” was keenly aware that the strand of islands faced pressure from tourists, developers and real estate agents, and, of…